Alexander - I have replaced both blowers (aft and fwd heads). You may already know this, but I recommend you test the breaker and leads at your switch to assure you have good juice first. If that's positive, time for a blower motor.
I have the floorplan with dinette option, and this might make a difference on your access points, but here goes...
You'll have to remove a vertical access panel on the inside of the shelved storage compartment, located in the salon. There are 2 storage areas on that wall. The fwd head blower is behind the forward/port opening (the aft head blower is on the same side, but behind the aft storage opening in salon). There are 4 screws in the black carpeting holding the access panel in place. Once removed, pull the panel, stick your head in there and you'll see the blower attached to the vent tube leading to the head.
Another way to find it, go outside and look for the fwd vent cover on the hull. I STRONGLY recommend you resolve the root cause of the failure by replacing these vent covers with a LOUVERED design that will channel water out away from the opening. Mine had flat breather openings that allowed water run-off to "run into" the openings leading down into the fan motor, eventually drowning the motor over time. I have had ZERO issues for >6 years now...
PS: Take your time. Dropping tools in that area (behind the gas tank) is a recipe for disaster (don't ask me how I know this)
Don